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Dataplicity - Dataplicity is a remote terminal for your Pi.
Wetty - Terminal over HTTP and HTTPS.
Pisth - Pisth is an open source SSH and SFTP client for iOS.
Bastillion - Bastillion is an open-source web-based SSH console that centrally manages administrative access to systems.
Prompt 2 by Panic - The best SSH client for iOS
TinyShell - TinyShell is an open source UNIX backdoor.